Countess Giulietta Guicciardi (1784-1856) was a piano pupil of Beethoven’s in about 1801. She fell in love with him for a time, and in 1802, he dedicated his Moonlight piano sonata to her, possibly after she had refused his marriage proposal. Of high birth, she probably didn’t think of Beethoven as a suitable husband, financially or otherwise. In 1803 she married Count Wenzel Robert von Gallenberg  (1783-1839), himself an amateur composer, and the two emigrated to Italy, only returning to Vienna in 1822.  In 1823, Beethoven is said to have recalled his relationship with Giulietta to Anton Schindler, but like everything else Schindler says, this must be regarded as dubious.